Ultra-Fine Tungsten Carbide Powder Prepared by a Nitridation–Carburization Method
Ultra-Fine Tungsten Carbide Powder Prepared by a Nitridation–Carburization Method
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DOI：
10.1111/j.1551-2916.2010.04091.x
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发表时间：
2010-11
影响因子：
3.9
通讯作者：
Shikuan Sun;Y. Kan;Guo‐Jun Zhang;Pei-ling Wang
中科院分区：
文献类型：
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作者：
Shikuan Sun;Y. Kan;Guo‐Jun Zhang;Pei-ling Wang
以柠檬酸盐溶胶-凝胶法制备的WO_3为原料，采用氮化-碳化法合成了WC粉末，并对其反应机理进行了探讨。结果表明，在NH3气氛中氮化后，WO_3转变为纳米W2N。然后，将W2N在CH4-H2混合气体中碳化，依次转变为W金属、W2C和WC。所得WC粉末的比表面积高达24.6m~2/g，颗粒尺寸为20~30 nm，比在CH4-H2混合气体中直接碳化WO_3制备的WC粉末细小得多。并对其原因进行了讨论。
WC powder was synthesized by a nitridation–carburization method with WO3 prepared by the citrate sol–gel route as the starting material, and the reaction mechanism was investigated. It was found that WO3 was converted to nanosized W2N after the nitridation process in NH3. Then, the W2N was transformed to W metal, W2C, and WC in sequence when it was carburized in CH4–H2 gas mixture. The WC powder obtained possessed a high specific surface area of 24.6 m2/g, and showed a particle size of 20–30 nm, which was much finer than the WC powder prepared by direct carburization of WO3 in CH4–H2 gas mixture. The reason was also discussed.